The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor

Frédéric Vogt, Frantz Martinache, Olivier Guyon, Takashi Yoshikawa, Kaito Yokochi, Vincent Garrel, Taro Matsuo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

The Subaru Coronagraphic Extreme AO project (SCExAO) is a high performance coronagraph designed to deliver high contrast at small angular separation. For the detection of structures near the diffraction limit, an accurate control of low order wavefront aberrations - tip-tilt and focus - is essential as these aberrations create light leaks that are the source of confusion in the final science image. To address this major difficulty, we have equipped SCExAO with a specially designed Coronagraphic Low Order WaveFront Sensor (CLOWFS) using defocused images of a reflective ring located in the focal plane, that can track tip-tilt errors as small as 10-3λ/D. CLOWFS was originally designed to drive actuators in a closed-loop. Here, we show that it can also be used in post-processing to efficiently subtract the tip-tilt induced coronagraphic leaks in the final science image.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems II
EditionPART 1
DOIs
StatePublished - Oct 18 2010
Externally publishedYes
EventAdaptive Optics Systems II - San Diego, CA, United States
Duration: Jun 27 2010Jul 2 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
NumberPART 1
Volume7736
ISSN (Print)0277-786X

Other

OtherAdaptive Optics Systems II
CountryUnited States
CitySan Diego, CA
Period6/27/107/2/10

Keywords

  • Adaptive optics
  • CLOWFS
  • Coronography
  • Extrasolar planets
  • PIAA
  • SCExAO
  • Subaru telescope

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Vogt, F., Martinache, F., Guyon, O., Yoshikawa, T., Yokochi, K., Garrel, V., & Matsuo, T. (2010). The subaru coronographic extreme AO (SCExAO) system: Implementation and performances of the coronographic low order WaveFront sensor. In Adaptive Optics Systems II (PART 1 ed.). [773612] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7736, No. PART 1). https://doi.org/10.1117/12.857915